What is the problem with the shell of my turtle. It start with one flake but at this moment it's expanding. He is living with two little one year res without a problem. Yesterday I saw that one res was biting the wound. We also went to a vet and he told me to keep the turtle on the dry by night and put isobetadine to deinfect the wound.

How big is your turtle? 20cmHow long have you had it? 11years

What is the water temperature? 27celciusDid you use a thermometer?yesAre you using a water heater?yesHow much water is in there?150 literAre you using a water conditioner?noAre you using any filtration?yes

What is the basking temperature? 30Is there a basking light?yesIs there a basking platform that is easy to climb on? yesWhat kind is it or what is it made out of? tileIs there a UVB light? yes

What have you been trying to feed it? pellets, liverWhen was the last time your turtle ate? no problem with eating

Is there any other unusual activity/symptoms? last year, he was very sick. he didn't eat for about 7 months and almost died. At this moment is he full of energy!

It's possible there is some sort of infection there, as it is not normal shedding. The marginal scutes around that area is also unusual -- almost looking as its fused. Where there infections/injuries/abnormalities around there before?